Drill-sharpener.



THEGDORE HIBAM PRDSKE` OF DENVER, CLORADG.

DRILL-SHARPENER.

Specification of Letters Patent.

y Patent-ea Jan., s, 1915.

Application filed May S, 1913. Serial No. 786,287.

To all 107mm it may conce/rn.'

Be it known that l, THEoDonn H. Priosnn, a citizen of the United States, residing at Jl Lowell Boulevard, in the city and county of Denver and State ot' Colorado, have invented certain new and useful Improvements in Drill-Sharpeners; and I do declare the following to be a ull, clear, and exact description ci' the invention, such will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of refe-rence- Inarked thereon, which form a part of this specification.

My invention relates to improvements in drill Sharpeners or apparatus particularly intended for sharpening the drill steels employed for rock drilling purposes.

The special object to be attained in the construction set forth in the drawing and hereinafter described is by the employment of a single manually operated lever to open the valve. which admits the motive iuid to the cylinder for operating the piston of the locking device, and also the valve which admits the motive fluid tothe horizontal hammer cylinder, the two valve-opening operations being accomplished in the proper sequence. it ,is important that the locking device or the means for holding the cutting extremity ci" the drill bit in the stationary position to receive the sharpening blows or' the dolly be actuated before the piston with in the horizontal hammer cylinder begins to operate for reciprocating the dolly. In my improved construction a single lever performs both functions, the construction and arrangement being such that the initial movement ot the said lever actuales the valve to admit motive fluid into the locking device cylinder on the side ot' the piston Jfor actuating the locking mechanism to cause the upper gripping die to engage the drill hit extremity and cooperate with the lower corresponding die to lock the drill bit in position for sharpening purposes; while as the movement ci the same lever is continued and in the saine direction, the throttle valve for the horizontal hammer is opened and the motive fluid admitted to the cylinder' t'orY reciprocating the dolly. lt will thus be seen that these two valves are actuated in lthe proper sequence, without any special yattention on the Apart of. the operator, thus mak ing it vimpossible OX' a person, no matter vsharpening mechanism proper how unskilled he may be in the use of ma.- chinery of this kind,.to make an erior.

lt will be understood that if the reciprocation ot the dolly were commenced before the drill bit was locked securely in place, the result would .be serious.

Having briefly outlined my improved construction, I vwill proceed to describe same in detail, reference being made to the accompanying drawing, in lwhich is illustrated an embodiment thereof.

ln this drawing- Figure l is a side elevation of a drill Sharpener equipped with my improvements. Fig. 2 is an end elevation of the same, or a View looking in the direction of arrow Q, Fig. 1. In this view the drill bit is shown in cross-section. Fig. B is a fragmentary centrally vertical section taken through the structure approximately on theline 3 3, Fig. 2. Fig. Ll' is a section taken on the line LA, Fig. 3, looking toward the left, the gripping dies, however, being shown in closed position instead of the open position, as in Fig. 3. Fig. 5 is a sectional .view taken through the valve mechanism for controlling the passage of motive fluid .to the locking device cylinder, the parts being shown on a larger scale than in, Figs. l and 2. Fig. 6 is a detail 'view illustrating the valve mechanism for controlling the passage orn motive fluid to the horizontal hammer cylinder, the parts being shown in section. Fig. 7 is a similar view, showing the valve and operating parts in the reverse position. Fig. 8 is a'fragmentary detail view showing the end lever in a position intermediate the positions shown in Figs 6 and 7. e Fig. 9 is a sectiontalen on theline 9 t), Fig. 8, looking toward the left. v

The saine reference characters illustrate the saine parts in all the views.

Let the numeral 5 designate the main framework of the structure upon which is mounted vthe vertical hammer cylinder 6, which controls the upper and lower drop dies 7 and 8. However, as this mechanism is quite distinct and separate from the drilland the means for controlling the same, to which my present invention more particularly relates', the vertically-disposed hammer mechanism .will not be Vvfurther set forth in detail.

nMo'vably mounted in the framework ofll movable cross-head 27,

cylinder 30. The motive fluid is supplied to y together with the two rods 9,

to receive upper and lower gripping dies 10 and l2, the lower die being stationary and supported by a block 13, while the upper die is movable and connected by means of a bolt or cap-screw 14, with a cross-head 15 mounted on the rods 9. These gripping dies 10 and 12 are fashioned, as shown at`16 and 17,

to correspond with the shape of the cutting head of the drill `steel when the same is prepared for the sharpening act of the dolly 18, the latter being made fast to the forward extremity of a stem 19, which extends into the horizontal cylinder 2O and is operated by means of a reciprocating piston (not shown)l striking the end of said stem for operating the dolly.

.A second cross-head 21 is mounted on the `two rods 9 and is supported'in a pre-determined position by means of nuts 22 threaded upon the rods below the said cross-head. 4

A link 23 of the locking mechanism is pivotally connected, as shown at 24, with lugs 25, formed on the cross-head 21 and eX- tending upwardly therefrom, the opposite extremity of the link being pivotally connected, as shown at 26, with a horizont-ally which is connected by means of a. piston stem 28 with a piston 29 located within the locking device cylinder 30. y

A valve 31 located within the casing 32 regulates the passage of motive fluid to the the valve chamber. through an inlet 33 and initially enters a cavity 34 which is alternately in communication with two passages 35 and 36, depending upon the position of the valve.

lWhen this valve is in the position illustrated in Fig. 5, or shifted farther toward the left, the cavity 34 is in communication, through a passage 37 formed in the valve, with the passage 36, which is in communication with a pipe 38, leading to the cylinder 30 forward or to the right of the piston 29 (see Fig. 1). When the valve is in this position, the motive fluid acts on the piston 29 to maintain the link 23 in the position shown in Fig. 3, whereby the upperl gripping die 10 is in the raised position and consequently disengaged from the cutting head of the' drill steel, assuming that the drill steel is in place as illustrated in the drawing.

Now if it is desired to sharpen the drill. steel, the motive fluid must be cut ofl" from the .pipe 38 and introduced to a pipe 39, which leads 'to the cylinder 30 and communicates with the latter in the rear of the piston 29, whereby the sai d iston is driven forwardly or toward the rig t (see Fig. 1) and the cross-head 27 actuated to cause the link '23 to approach the vertical position shown and 4, whereby the cross-head 21,

.in Figs. 1

is moved actuating the upper gripping v shifting the valve-31 Vfor 41, the said stem passing through astufiingp box 42 in a head 43 of the valve casing or chest. The outer extremity of this stem is pivotally connected, cas shown at 44, with a rod 45 which passesl through a perforation formed in a lug. 46 mounted on the short arm 47 of a bell crank lever 48 which is fulcrumed at 4, the opposite arm 50 of the lever being relatively long andextending forwardly for convenience of hand manipulation. lnterposed betweenv the lug 46 and a stop-nut 3 threaded on the forward extremity of the rod 45, is a spiral spring 49 ofv sulicient stiffness that when the arm 50of the bell crank lever is pressed downwardly or moved in the direction of the arrow in Fig. 1, the forward movement will be imgins its downward movement and the arm' 47 its forward movement, the pin 58 is in the rear extren'iity of the slot 57 or the extremity farther to the left, referring to F ig. 1. 11eme, during the initial operation of the lever 48 whereby the valve 31 is shifted forwardly and communication established Within a valve' y which 1s con' .nected by means of a stem 53 with a rod 54,

pin 58 carried byh between the cavity 34 of the valve-chest 32 and the horizontal cylinder in the rear f the piston 29, no movement 1s imparted to the rod 54 or the valve within the casing 52,

-since the pin 58 carried hy the lever arm 47 57, the said slot beingV moves idly in the slot of sufiicient length to permit the shifting of the valve 31 forwardly for the purpose stated before movement is imparted to the valve within the casing 52. However, as soon as the valve 31 has been properly shifted to its forward position for the purpose aforesaid, the pin 58 has reached the forward extremity of the slot 57, and then as the lever 48 'is moved farther in the same direction, the rod 54 is actuated to shift the valve within the casing 52 to its forward position, whereby the motive dluid is delivered to the horizontal. cvlinder o roi' yreclpromitinf.; the piston therei/p. wherein;

the dolljlv is actu-ated lor sharpening the drill steel. as heretofore outlined. After the rod l has heen actuated to shift the valve to its forward limit of nlofeinent, the further movement oi the lever lo in the saine direction will serve lo compress tlie.

spiral spring ll?. .rlalreliy as soon as the operator releases the lever -i-S, the recoil the spring' -l will return the lever to its position"at the time of complet-ing the forward movement ot the valve l. Non' it it lis desired to return the vulve 3l to its nor- 'ninnieation between the horizontal Cylinder 2O and the motive llnid.I .W iereby movement of the dolly is stopped. These'operations will be completed in the reverse order in which the two valves were originalh7 shifted., that is to say, the valve in the easing 52 will he liz-st actuated to ont oftA communication with the horizontal cylinder to stop the movement of Ithe dolly. 'after which the valve 3l will he. shifted Within the casing 32. whereby the motive fluid will be ent otl 'from the cylinder 3l) in they reur oi: the piston 29 and introduced to the saine cylinder forward ot the pist-on o'herebj\Vy the said piston moved rearwardly and the link Il actuated to litt the gripping die l0. as heretot'ore eri 1in-girl. y

The manner ol operating the ralxje ll within the casing fr.) is illustrated in Figs.

(l and 7. rlhe manier ol" opening this valve has heretofore been explained in a general way. namely. by the m rement of the arm 'l-T ot' the lever -ll liter the Valve 3l has been ehil'ted to its Yjoiwvard limit ol" movement. alter which 4the spring 49 cornpresseil by he engagement'ot the lng l@ therewith. lt shonld he explained that thi?,k lng' is pifotalljv Conner-ted with the lever arm AlT to allow it to adinet iti-elli to the relying' positions ot its lever arm 4T. The valve G() is norrnalljv held Ain the closed position. whereby tle motive ylaid is rut off tromthe horizontal hummer eylinde by means ot' :1 spring interposed between the valve proper and a stalling-box (r2 'of the valreehest. The operation of the main valve within the chest for controlling the Inotive fluid for reciprocating the doll;7 will not he described in detail as nothing is claimed therein, the operation being old in the art.

Aissinning now that the drill bit, has-been sharpened und the operator has released the downward prt--sure on the arm 50, the recoil ot the spring lll, which o s compressed during the opening ol` the valve (il), will first out on the lever erin to actin-ete the lever le and return its arin e? to its position ininlediateljyY after the opening ot the valve 3l and before the commencement ot' the operation which opens the vilre 60. rl"his position is illustrated in Fig. S, in which the lug -l-l is in engagement Vith the forward. snr- 'tare of an adjustable stop-nut (3?), mounted on the rod l5. '.l`he valve o() being Closed, the motive fluid is Cut oli' from the horizontal haniiner rylinder 20 and the reciprocation ol' the dolly stopped. The operator then. by a further movement or" the lever '-tS, in the direction opposite the arrow in Fig. l, will move the rod lo rearwardly and return the valve 3l. toits rearward position or that shown in Fig. 5. whereby the motive fluid is introduced to the cylinder 30 forward olf the piston ".39 through the medium of the pipe 25S. the fluid acting on the pisuon 2O to more the latter rearwardly and return the. link to its normal position or that illustrated in vlpig. whereby the gripping die l() is lifted and the drill bit released as will he readilj,T understood.

From the foregoing description, the use and operation otinf; improved drill sharpener will he readilyY understood.

Assuming' that the niaehine is at rest and thut it. is de ed to sharpen the drill steel, .l shall turther assume that the gripping die l() is in the raised position and that the operating parte ot the .so-called locking meehanisni are eorrespondingly located. Under these rirrinnetanres the lever 4.8 is in the pli-tion illustrated in Fig. o of the drawing'. while the valve lll is in a correspondposition. That to say, the valve o@ whirh nnte oilA connulinieation between 1*.;- niotire llnid and the horizonlal han'in rrlinder if) is in the closed position. The operator then in-n'efs the arm 'l' of the lever llownn'ardliv or in the direction of the arronv in Vig. l. whereby the lever is lirst moved to the no., tion shown in Fig'. 8 which moves the 'valve to its torward position and opens; c-ninlnnniration beto-'een the cylinder IH? in the rear ol the pieton 29. through the nediinn olf the pipe 23S) and other connections as heretofore described. The action ot the motive linid on the piston Z9 will more the latter 'toiirardly-irherehy a eorrespondinggino-rement. is imparted to the cross-head 2T .andthe link I3 caused lo approach the vertical position or that illustrated in Figs. l und 1.-. This ino-rement ot' the link acts on the cross-head '2l to move the latter together with the rods 9 downwardly. bringing the gripping die 10 into engagement with the head o5 oi the'clrill steelthus the movement of locking the latter tightly in place for sharpening purposes. The operator will .then continue the movement of the arm 7 of the lever 48 in the direction of the arrow in Fig. 1, whereby thev lever is moved from the position shown in Fig. 7. It will be understood that during the lever from the position 1n Fig. 6, to that in Fig. 8, the spring 49 has not been compressed, since its tension or strength is such that the forward move'- vment of the valve 81 requires less resistance' than would be necessary to compress this spring. Consequently the spring is in its normal or` expanded position until the lever begins, to move from the position in Fig. 8 toward the position in Fig. 7. The collar 46 then begins to move Iorwardly on the rod 45 and away from the stop-nut 63, since the rod 45 cannot move farther forwardly as its valve 3l is at its forward limit of movement in the valve-chest 32, being in engagement with the head 43 of the said chest. Hence, during the movement of the lever 48 from the position shown in Fig. 8 tothat shown in Fig. 7, the spring 49 is compressed and the collar 46 moves forwardly from the stop-nut 63, far enough to open the valve 60 and admit motive hammer cylinder.

It should be further explained that during the movement of the lever 48 from the position shown in Fig. 6 to that shown in Fig. 8, the pin 58, which connects the lever arm' 4:7 with the rod ll, moves in the slot 57 and consequently there is no movement of the rod 54 orof the valve'O until after the valve 3l is shifted to its forward limit of movement and the mot-ive fluid delivered to the;cylinder 30 in the rear of its piston. However, during the movement of the lever from the position in Fig.. 8 to that in Fig. 7, whereby the spring 49 is compressed, the rod 54 moves forwardly, whereby the valve 60 is opened and the motive iiuid allowed to pass to the horizontal hammer cylinder 20 for the purpose of reciprocating the piston striking the dolly stem for drill steel sharpening purposes. The operator will then hold the lever Li8 in the position shown in Fig. 7 until the sharpening operation is complete. He will then release the pressure on the arm 47 of the lever and the recoil or expansion of the spring 49 will first return the lever automatically tothe position shown in. Fig. 8, and the spring 61 in the meantime will automatically act on the valve 60 to close the latter and eilt ofi the motive fluid from the horizontal hammerv cylinder 2O and stop the movementof, the dolly. The operator will then move'the arm 50 vof the lever 48 in the direction opposite the arrow in Fig. 1., whereby the lever arm 47. will act through themedium of its collar and the 'stop-nut 63 on the rod Fig. 8 to thatshown inluid to the horizontal 45 to move the latter rearwardly and return the valve 3l to its rearward position, whereby the motive Huid is cut oft' from the cylinder 3() in the rear of the piston 29, and introduced into the same cylinder forward of the said piston, through the medium of the pipe 38. In this event, the piston 29 will be moved rearwardly and the link 23 returned to the position shown in Fig. 3, whereby the gripping die l0 is raised and the drill bit released, thus permitting it to be removed from the machine which is then ready to receive another drill bit, when the t operation maybe repeated.

I claire-e l. In mechanism ot the class described,

the combination of two valve chests and two valves, rods connected in operative relation with the valves, a lever suitably fulc'rumed, a perforated lug mounted on one arm of the lever and through which the iii-st rod passes,

a stop-nut mounted on the said rod in the rear of the lug, a second stop-nut mounted on the rod forward of the lug, a spiral spring interposed between the lug and the forward stop-nut, the spring being of suiiicient tension to resist compression during theA valve-operating movement of the first rod, the second rod having a slot through which a' pin carried by the said lever arm passes, the arrangement being such tl movement of the lever to artuate t rod for valveoperating purposes e c pin carried oy the said lever arm to f idly in the slot of the second rod until forward extremity is reached, after which the movement of the leverfin the samedirection actuates the second rod to operate its respective valve, substantially as described.

2. In adrill sharpening machine the com -bination of two valves, a lever, an operative connection between the lever and both valves to open thev latter in succession during the movement of the lever in a given direction, the connection and arrangement of parts being also such that the vaiverst opened remains inactive during the opening movement of the second valve, means for automatically returning the lever to the .position it occupied when the opening movementv of the first valve was completed, means for automatically and simultaneously clos ing the second valve while the Iirst valve is still open and fluid operated means controlled by said valves for locking a drill in position to be sharpened and for .performing the sharpening operation.

3. In a drill Sharpener, the combination with a reciprocable device on the drill steel to perform the sharpening function, and a locking device for holding the drill steel in place during the sharpeniig operation, said locking device including a pair of movably mounted, parallel vertically disposed rods, a jaw mounted.'

arranged to act upon the upper extremities of said rods and In testimony whereof I ax my signature daptmdbto copelat; with a ationarydjw in presence of two witnesses. ocate elow sai rst name jaw an etwee the said rods, means fo; operating THEODORE HIRAM PROSKE' 5 the locking device, and a link connecting che Witnesses:

said operatg means and the vertically dis- A. J. OBRIEN,

' posed rods, substantially as'described. C. M. WAUDBY. 

